Validation of a method to measure the vector fidelity of triaxial vector sensors

Freitas, J M De

doi:10.1088/1361-6501/aaba41

Cited by 4 publications

(3 citation statements)

References 55 publications

(71 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…restricting the further improvement of navigation performance of inertial navigation system [1]. In recent years, the research on the influence of temperature [2][3][4][5], magnetic circuit [6][7][8], pendulum reed structure [9][10][11], calibration error [12][13][14][15][16] and other factors on the performance of QFA has been relatively mature, but the research on the internal components of QFA and readout circuit generated noise during operation is relatively few. Zhou et al [17] designed a single carrier modulated differential capacitance detection circuit, which can effectively eliminate the influence of parasitic resistance and capacitance and theoretically ensure the stability of sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Study on driving noise of quartz flexible accelerometer torquer

Zhang

Zhao

et al. 2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

The distributed capacitance inside the quartz flexible accelerometer (QFA) coupled the high frequency voltage excitation signal in the differential capacitance detection circuit to the torquer coil, and superimposes the torquer driving current to form the driving noise. In this study, the values of the distributed capacitance inside the QFA were simulated. According to the formation mechanism of the QFA driving noise, the equivalent circuit model of the driving noise is established, and the driving noise characteristics of the detection circuit with single excitation and double excitation source are analysed. The theoretical and experimental results show that the electric field coupled driving noise transmission system is a first-order system with high-pass characteristics. The driving noise of the single excitation detection circuit is larger than that of the dual excitation detection circuit, and the dual excitation detection circuit can reduce the driving noise by 39.77% when the QFA shell is grounded. The equivalent acceleration of the electric field coupled driving noise is between tens of μg to hundreds of mg, which is one of the important noise sources that affect the measurement accuracy of the QFA. A measure was proposed to suppress the high-frequency driving noise by adding a low-pass filter after the sampling output of the driving current, which can reduce the driving noise to 1.85 μg and effectively reduce the influence of the driving noise on the measurement accuracy of the QFA.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on driving noise of quartz flexible accelerometer torquer

Zhang

Zhao

et al. 2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The directions of arrival estimation performances of perturbed orthogonal vector sensors have been studied in [ 13 , 18 , 19 ]. In [ 13 ], an algorithm was developed for direction finding using an imperfect (non-orthogonal) biaxial velocity sensor.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, this skewness was not uniform across the sensors. De Freitas [ 18 ] proposed a method for estimating the misalignment angle and vector fidelity of a nominally triaxial accelerometer. This analysis can easily be extended to the biaxial acoustic vector sensor.…”

Section: Introductionmentioning

confidence: 99%

A Lower Bound on the Estimation Variance of Direction-of-Arrival and Skew Angle of a Biaxial Velocity Sensor Suffering from Stochastic Loss of Perpendicularity

Nnonyelu

Jiang

Lundgren

2022

Sensors

View full text Add to dashboard Cite

The biaxial velocity sensor comprises two nominally perpendicular particle velocity sensors and a collocated pressure sensor. Due to real-world imperfections in manufacturing or setup errors, the two axes may suffer from perpendicularity losses. To analytically study how skewness affects its direction-finding performance, the hybrid Cramér-Rao bound (HCRB) of the directions-of-arrival for the polar angle, azimuth angle and the skew angle of a biaxial velocity sensor that suffers from stochastic loss of perpendicularity were derived in closed form. The skew angle was modeled as a zero-mean Gaussian random variable of a known variance, which was assumed to be very small, to capture the uncertainty in the orthogonality of the biaxial velocity sensor. The analysis shows that for the polar and azimuth angle, the loss of perpendicularity introduces the variation of the HCRB along the azimuth angle axis, which is independent of the skew angle, but on its variance. The dynamic range of this variation increases as the variance of the skew angle increases. For the estimation of the skew angle, the HCRB of the skew angle is bounded upwards by the variance of the skew angle and varies with the azimuth angle. The hybrid maximum likelihood- maximum a posterior (hybrid ML/MAP) estimator was used to verify the derived bounds.

show abstract

Revised error calibration model of linear accelerometer on precision centrifuge

Sun

Ren

Wang

2019

Review of Scientific Instruments

View full text Add to dashboard Cite

The common error calibration model of a linear accelerometer usually cannot meet the accuracy requirement without considering the influence of misalignments in the precision centrifuge test. In order to improve the calibration accuracy, a series of coordinate systems is established and precise accelerations along the input axes of the accelerometers are deduced first. Then, by analyzing the mechanisms of the main error sources, the revised error calibration model is established which includes the misalignments, the radius errors, and the nonlinearity error terms. Then, the measurement methods are proposed to estimate the initial angular misalignments, the installation angular misalignments, and the installation radius misalignments by a theodolite and the accelerometer themselves in the different modes of the centrifuge, respectively. Finally, the experimental measurement results show that the initial angular misalignments are estimated accurately and less than 0.5′ after adjustment. Further investigation shows that the adequacy of the common error calibration model decline obviously and the calibration accuracies are lower than 6 × 10−3g/g without considering the misalignments. After compensating for the misalignments in the revised model, the error coefficients are identified precisely, and the calibration accuracies are higher than 1.5 × 10−3g/g.

show abstract

Validation of a method to measure the vector fidelity of triaxial vector sensors

Cited by 4 publications

References 55 publications

Study on driving noise of quartz flexible accelerometer torquer

Study on driving noise of quartz flexible accelerometer torquer

A Lower Bound on the Estimation Variance of Direction-of-Arrival and Skew Angle of a Biaxial Velocity Sensor Suffering from Stochastic Loss of Perpendicularity

Revised error calibration model of linear accelerometer on precision centrifuge

Contact Info

Product

Resources

About